PF-06650833

DAS28 is a measure based on assessment of 28 joints for tenderness and swelling (tender and swollen joint counts). Disease Activity Score 28-C reactive protein (DAS28-CRP) is derived using differential weighting given to 4 components: tender joint count (range: 0-28), swollen joint count (range: 0-28), patient global assessment (recorded on a visual analog scale \[VAS\] scale of 0-100 mm), and CRP (milligram per liter). DAS28-CRP score ranges from 0 to 9.4. The lower the DAS28-CRP score is, the better the participant has response (remission = score\<2.6, low disease activity = score≤3.2). A negative value in change from BL indicates an improvement. Mixed Model Repeated Measures was used for statistical analysis, which used the change from BL of DAS28-CRP as an outcome and treatment, scheduled study visit, BL value of DAS28-CRP, treatment by visit interaction and BL by visit interaction as fixed effects. The model used the unstructured covariance matrix.

HiSCR response was defined as at least a 50% reduction in total abscess and inflammatory nodule (AN) count relative to baseline, and no increase in abscess count, and no increase in draining fistula count. Confidence interval (CI) was calculated using Blyth-Still-Casella method.

The SDAI is a continuous composite measure derived from components of the American College of Rheumatology (ACR) Core Dataset.The SDAI was calculated using the following formula: SDAI = Tender / Painful Joint Count(TJC) (using 28 joints) + Swollen Joint Count (SJC) (using 28 joints) + Patient Global Assessment of Arthritis (PtGA) (0-10 cm scale) + Physician's Global Assessment of Arthritis (PhGA) (0-10 cm scale) + high sensitivity C-reactive protein (hsCRP) (mg/dL). SDAI total score= 0-86. SDAI \<=3.3 indicates disease remission, \>3.4 to 11 = low disease activity, \>11 to 26 = moderate disease activity, and \>26 = high disease activity. The primary analysis utilized a Bayesian ANCOVA model with an informative placebo prior distribution with borrowing from tofacitinib historical placebo data. The confidence interval was credible interval in this statistical analysis. The efficacy endpoint for the tofatinicib arm was an exploratory endpoint and neither primary nor secondary endpoints.

AUClast was defined as area under the plasma concentration-time profile from time 0 to the time of the last quantifiable concentration. AUClast for EE was determined using linear/Log trapezoidal method.

AUClast was defined as area under the plasma concentration-time profile from time 0 to the time of the last quantifiable concentration. AUClast for LN was determined using linear/Log trapezoidal method.

Cmax was defined as maximum plasma concentration. Cmax for EE was observed directly from data.

Cmas was defined as maximum plasma concentration. Cmax for LN was observed directly from data.

Maximum plasma concentration (Cmax) of PF-06650833

Dose-normalized area under the plasma concentration versus time curve from time zero extrapolated to infinite time (AUCinf(dn)) of PF-06650833 (if data permit)

Quantitative changes in ECG intervals